Perseus: An excellent digital library of the Classical World, including maps, art, archaeology, texts, encyclopaedias, Smyth's Greek Grammar, An overview of Greek Syntax by Jeffrey Cox Rydberg, lexica, and More.
Ancient World Mapping Center: A collection of free downloadable maps for educational use and some
Diotima: Materials for the Study of Women and Gender in the Ancient World.
Internet Classics Archive: Sponsored in part by the MIT Program in Writing and Humanistic Studies. Select from a list of 441 works of classical literature by 59 different authors. Mainly Greco-Roman works (some Chinese and Persian), all in English translation.
LATO: Library of Ancient Texts Online (a catalogue of ancient Greek online texts)
Greek Mythology: The material in the Greek Mythology Link includes Text, Images, Tables, and Maps. Unless stated otherwise articles and lists are from or based on The Genealogical Guide to Greek Mythology, by Carlos Parada.
Mythology in Western Art: An archive of images in Western art which have allusions to ancient Greek and Roman Myth.
Exploring Plato's Dialogues: Texts, bibliography, discussion, etc. on selected dialogues of Plato.
Supplement to Thrasymachus: learning ancient Greek
Let's review Greek!: Reviewing Ancient Greek Language
GREEK GRAMMAR ON THE WEB: The Electronic Gateway to the Study of Ancient Greek
Stoa Consortium: An evolving collection of on-line projects on the ancient world
Acropolis 360: An interactive virtual tour of the Acropolis and its major monuments